:root {
  color-scheme: dark;
}

html, body {
  margin: 0;
  padding: 0;
  background-color: #090D1A;
  background-image:
    radial-gradient(at 0% 0%, rgba(99, 102, 241, 0.15) 0px, transparent 50%),
    radial-gradient(at 100% 0%, rgba(6, 182, 212, 0.10) 0px, transparent 45%);
  background-attachment: fixed;
  color: #F8FAFC;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
}

.app-shell {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.sticky-header {
  display: block;
  width: 100%;
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(13, 17, 23, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: env(safe-area-inset-top, 0px);
}

.header-inner {
  max-width: 1120px;
  width: 100%;
  box-sizing: border-box;
  margin: 0 auto;
  height: 80px;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.main-container {
  max-width: 1120px;
  width: 100%;
  box-sizing: border-box;
  margin: 0 auto;
  padding: 20px 24px max(24px, env(safe-area-inset-bottom, 0px));
  flex: 1;
}

.hero-card {
  background: rgba(22, 27, 34, 0.72);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 16px;
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.3);
  transition: border-color 0.2s ease;
}

.hero-card:hover {
  border-color: rgba(255, 255, 255, 0.14);
}

.spectrum-text {
  background-image: linear-gradient(135deg, #34D399 0%, #06B6D4 35%, #3B82F6 70%, #8B5CF6 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.spectrum-btn {
  background-image: linear-gradient(135deg, #34D399 0%, #06B6D4 35%, #3B82F6 70%, #8B5CF6 100%);
  color: #FFFFFF;
  font-weight: 700;
  border: none;
  cursor: pointer;
  transition: opacity 0.15s ease, transform 0.15s ease;
}

.spectrum-btn:hover { opacity: 0.94; }
.spectrum-btn:active { transform: scale(0.97); }
.spectrum-btn:disabled { opacity: 0.5; cursor: not-allowed; }

.glass-btn {
  background: rgba(30, 41, 59, 0.75);
  border: 1px solid rgba(255, 255, 255, 0.08);
  color: #E2E8F0;
  cursor: pointer;
  transition: all 0.15s ease;
}

.glass-btn:hover {
  background: rgba(51, 65, 85, 0.85);
  border-color: rgba(255, 255, 255, 0.16);
  color: #FFFFFF;
}

.glass-input {
  background: rgba(9, 13, 26, 0.7);
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: #F8FAFC;
  border-radius: 10px;
  padding: 9px 12px;
  font-size: 14px;
  width: 100%;
  box-sizing: border-box;
  outline: none;
}

.glass-input:focus {
  border-color: #38BDF8;
}

.nav-tab {
  padding: 7px 14px;
  border-radius: 10px;
  font-size: 13px;
  font-weight: 600;
  color: #94A3B8;
  background: transparent;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.15s ease;
}

.nav-tab.active {
  color: #F8FAFC;
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.12);
}

.email-row {
  padding: 14px 16px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  transition: background 0.15s ease;
}

.email-row:last-child {
  border-bottom: none;
}

.email-row:hover {
  background: rgba(255, 255, 255, 0.03);
}

/* iOS PWA 視窗防護與雙軌 64px 頂欄 */
@media (max-width: 768px) {
  html, body {
    height: 100% !important;
    height: 100dvh !important;
    min-height: 0 !important;
    position: fixed !important;
    width: 100% !important;
    overflow: hidden !important;
  }

  .app-shell {
    height: 100%;
    height: 100dvh;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
  }

  .header-inner {
    height: 64px;
    padding-left: max(16px, env(safe-area-inset-left, 0px));
    padding-right: max(16px, env(safe-area-inset-right, 0px));
  }

  .main-container {
    padding-left: max(16px, env(safe-area-inset-left, 0px));
    padding-right: max(16px, env(safe-area-inset-right, 0px));
    padding-bottom: max(20px, env(safe-area-inset-bottom, 0px));
  }
}